Answer: a. 2.54 cm ( the number of centimeters in exactly 1 in) and c. 4 choices ( the number of choices in this list)Justification:1)a. 2.54 cm( the number of centimeters in exactly 1 in)Although theexact lengthof one inch has varied in the past, currently the inch is defined as exactly 2.54 cm, so this is an exact number.b.56.00 s( a time measured by a stopwatch)The time measured by a stopwatch isnot an exact number. The number is limited by the precision of the instrument (the stopwatch) and it migh have been 56.004 instead of 56.00, and the stopwatch cannot shoe that. So, this is not an exact number.c.4 choices( the number of choices in this list)This is, indeed anexact number. It is 4, not 4.1, nor 3.9, nor any other number.d.3 lbs( the weight of an object measured on a scale )As reasoned with the stopwatch, this measure, 3 lbs, is subject to the precision of the scale. It isnot an exact number.It could be other number close to 3: 2.99 for example....

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